package com.atcumt.meituan;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/* 
 * 串烤串：按照 A1B1A2B2...AnBn的规则
 * 输入:
 * 4
 * abcd
 * efgh
 * 输出：aebfcgdh
 */
public class Q1 {
    
    public static void main(String[] args) throws IOException {
        
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        // BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(System.out));

        int n = Integer.parseInt(reader.readLine());
        String A = reader.readLine();
        String B = reader.readLine();
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < n; i++) {
            sb.append(A.charAt(i)).append(B.charAt(i));
        }
        System.out.println(sb);
        reader.close();
    }
}
